[core] Improve and test ctrl queue implementation

[ldalek]

Because events are processed sequencially there's case when some events might be blocked because of processing time of other events.

...
	/* Event sequence */
	push_event(wifi_event_type_hal_ind);
	push_event(wifi_event_type_hal_ind);
	push_event(wifi_event_type_hal_ind);
	push_event(wifi_event_type_webconfig);
	push_event(wifi_event_type_hal_ind);
	push_event(wifi_event_type_hal_ind);
...

LD_LIBRARY_PATH=$PWD ./ctrl-queue
handle_hal_indication:71: Processing delay: 0
handle_hal_indication:71: Processing delay: 10
handle_hal_indication:71: Processing delay: 20
handle_hal_indication:71: Processing delay: 230
ctrl-queue: ctrl-queue.c:72: handle_hal_indication: Assertion `delay < 200' failed.
make: *** [Makefile:96: r] Przerwane